It is a form of essay that attempts to analyze a problem and propose one or more solutions to it. From the options given the one that is narrow enough to serve as a subject is option C because the others are way too broad to write down an essay.
The rest of the options are an attempt to analyze the entire policies of education.
Answer:Isolationists believed that World War II was ultimately a dispute between foreign nations and that the United States had no good reason to get involved. The best policy, they claimed, was for the United States to build up its own defenses and avoid antagonizing either side.